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Homework answers / question archive / University Of Arizona ATMO 170A Chapter 8 1)A stationary front does not move because winds on both sides of the front
University Of Arizona
ATMO 170A
Chapter 8
1)A stationary front does not move because winds on both sides of the front .
a. are calm
b. blow parallel to the front and in opposite directions
c. blow away from the front and are of equal strength
d. blow against each other and are of equal strength
2. According to the model of the life cycle of a wave cyclone, the storm system is normally most intense as a(n) .
a. frontal wave
b. open wave
c. stationary wave
d. mature cyclone
3. An air mass is characterized by similar properties of and in any horizontal direction at a given altitude.
a. temperature; pressure
b. pressure; winds
c. pressure; humidity
d. temperature; humidity
4. Atmospheric shortwaves tend to when they approach a longwave trough and when they approach a ridge.
a. deepen; deepen
b. deepen; weaken
c. weaken; deepen
d. weaken; weaken
5. Cold fronts that move into the U.S. from the east, or northeast, are called .
a. eastern fronts
b. back door fronts
c. stationary fronts
d. warm-type occluded fronts
6. Compared to an mP air mass, mT air is .
a. warmer and drier
b. warmer and moister
c. colder and drier
d. colder and moister
7. Cyclogenesis occurs frequently on the eastern slopes of the Rockies as a result of .
a. occlusions
b. compressional heating
c. drylines
d. convergence
8. Developing low pressure areas generally have air near the surface and air aloft.
a. converging; diverging
b. diverging; converging
c. converging; converging
d. diverging; diverging
9. Drylines typically occur in the United States.
a. Pacific Northwest of the
b. southern Great Plains of the
c. northeastern
d. southeastern
10. During a cold occlusion, the cold front forces the warm front to .
a. become stationary
b. rise off the ground
c. move to the side
d. dissipate
11. During the winter, an air mass that moves into coastal sections of Oregon and Washington from the northwest would most likely be .
a. mP
b. mT
c. cP
d. cT
12. For a surface low to develop into a major storm system, the upper-level divergence of air must be
surface convergence of air.
a. greater than
b. less than
c. equal to
d. the same as
13. For a surface storm system to intensify, the upper trough of low pressure must be located to the
of the surface low.
a. north
b. south
c. east
d. west
14. Generally, the average speed of a warm front the average speed of a cold front.
a. is about the same as
b. is slower than
c. is faster than
d. varies compared to
15. Generally, the greatest lake-effect snowfall in the Great Lakes region occurs on the shores.
a. northern
b. southern
c. eastern
d. western
16. If lows and highs aloft are directly above lows and high at the surface, .
a. the surface system would dissipate
b. the surface system would intensify
c. cyclogenesis will occur
d. anticyclones will form
17. In the polar front theory of a developing wave cyclone, the area of most intense weather is normally found to the of the storm’s center.
a. northeast
b. southwest
c. southeast
d. northwest
18. Lake-effect snows are best developed around the Great Lakes during .
a. early spring when moist, tropical air moves over the frozen lakes
b. late fall and early winter when cold, dry polar air moves over the relatively warm water
c. late fall and early winter when moist, polar air sweeps in from the east
d. middle winter when the unseasonably warm air mass moves over the cold water
19. Mid-latitude cyclonic storms are better developed in the United States during the coldest months because the polar jet stream .
a. is weakest in the winter
b. moves farther north in the winter
c. is shut down in the winter
d. moves farther south in the winter
20. One would expect a cP air mass to be .
a. cold and dry
b. cold and moist
c. warm and dry
d. warm and moist
21. Record breaking low temperatures are associated with which air mass?
a. mT
b. mP
c. cP
d. cT
22. Squall lines most often form ahead of a(n) .
a. cold front
b. warm front
c. stationary front
d. occluded front
23. The air pressure normally before a cold front passes and after the front passes.
a. drops; drops
b. drops; rises
c. rises; rises
d. rises; drops
24. The coldest of all air masses is .
a. cA
b. mP
c. cT
d. cP
25. The forward progress of a warm front may be inhibited at night as a result of .
a. warming of air behind the front
b. radiational cooling
c. overrunning
d. a dryline
26. The region of air between the cold and warm fronts of an open wave is known as the .
a. warm sector
b. frontal wave
c. occlusion
d. convergence
27. The stages of a developing wave cyclone (in order of occurrence) are .
a. stationary front, open wave, frontal wave, mature, and advanced occlusion
b. stationary front, frontal wave, open wave, mature, and advanced occlusion
c. stationary front, open wave, frontal wave, advanced occlusion, and mature
d. stationary front, frontal wave, open wave, advanced occlusion, and mature
28. The typical path of a winter mid-latitude cyclone is .
a. westward or northwestward
b. eastward or northeastward
c. southward or southeastward
d. southward or southwestward
29. What is the best source region for an air mass?
a. mountains with deep valleys and strong surface winds
b. generally flat areas of uniform composition with light surface winds
c. hilly with deep valleys and light winds
d. generally flat area of uniform composition with strong surface winds
30. What is the origin of the cP and cA air masses that enter the United States?
a. Northern Siberia
b. the northern Atlantic Ocean
c. Antarctica
d. Northern Canada and Alaska
31. What type of air mass would be responsible for daily afternoon thunderstorms along the Gulf Coast of the United States?
a. mP
b. mT
c. cP
d. cT
32. What type of air mass would be responsible for hot, dry summer weather in southern Arizona?
a. mP
b. mT
c. cP
d. cT
33. What type of air mass would be responsible for hot, muggy summer weather in the eastern half of the United States?
a. mP
b. mT
c. cP
d. cT
34. What type of weather front would be responsible for the following weather forecast? "Increasing cloudiness and warm today with the possibility of showers by this evening. Turning much colder tonight with southwesterly winds becoming gusty and shifting to the northwest."
a. cold front
b. warm front
c. warm-type occluded front
d. stationary front
35. What type of weather front would be responsible for the following weather forecast? "Increasing high cloudiness and cold this morning. Clouds increasing and lowering this afternoon with a chance of snow or rain tonight. Precipitation ending tomorrow morning. Turning much warmer. Winds from the south and becoming southwesterly tomorrow."
a. cold front
b. warm front
c. stationary front
d. cold-type occluded front
36. When a cold front passes, the lowest pressure reading at a station will occur .
a. just before the front passes
b. just after the front passes
c. just as the front passes
d. three hours after the front passes
37. When two air masses collide at a front, one air mass may be pushed upward by the other. This is because .
a. one air mass is moving faster than the other
b. one air mass is denser than the other
c. pressure is falling in one air mass and rising in the other
d. one of the air masses encounters topographical features on the ground
38. When upper-level divergence of air above a surface low exceeds the surface convergence of air, the surface air pressure will and the storm itself will .
a. increase; intensify
b. increase; dissipate
c. decrease; intensify
d. decrease; dissipate
39. Which air mass forms over North America only in summer?
a. mT
b. mP
c. cT
d. cP
40. Wintertime Atlantic mP air masses are less likely to move into the United States than those along the Pacific coast primarily because the .
a. water is colder along the Pacific coast
b. prevailing winds alof t are westerly
c. source region for mP air on the Atlantic coast is western Europe
d. water is warmer along the Atlantic coast
